I was driving on the interstate and smelled what I thought was burning wires or rubber. Turning the climate control off stopped the smell. The auxiliary water pump was disconnected to take it out of the equation.

Today I pulled the blower expecting it to be bad. I hooked it to a spare battery and have let it run for 1/2 hr. There is no indication of a problem.

The car has been idling without problem with climate on and no blower. I'll probably go drive and swap the extra blower if driving without doesn't turn up anything.

Any thoughts?

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

Solved. The blower has 2 speeds. It seemed to work on high but eventually got hot and stiff compared to the one from the parts car.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

This is a good reminder for all W126 owners to clean the leaves and debris from the blower resister under the brake booster.

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge

Leaves didn't have anything to do with it. This blower is worn out. I've always kept the leaves clear. It is an ongoing battle in the fall because we have lots of trees and no cover.

I had to look closely with a mirror to find the screws.

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85SD 240K & stopped counting painted, putting bac together. 84SD 180,000. sold to a neighbor and member here but I forget his handle. The 84 is much improved from when I had it. 85TD beginning to repair to DD status. Lots of stuff to do.

I understand that. My comment was meant to remind anyone who may have forgotten about the leaf issue. It is pervasive and can be catastrophic if left unattended.

Glad you solved your problem, though.

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge